I am trying to make a textArea scroll by a 'display length'
using actionscript, to clarify, the textArea could be set to any
height, and if the content overflows then instead of scrollbars
appearing a 'next>>' button appears, when this is clicked the
text is scrolled by the height of the box, effectively paginating
the text.

In the actionscript 3.0 cookbook there is an explanation
(chapter 9) on scrolling textFields with actionscript, whereby
important properties like bottomScrollV are available to make this
quite simple.

However I am using a textArea, in which the bottomScrollV
property is not available.

In the flex docs, it says that each textArea has a textField
property:

"textField: property - protected var textField:IUITextField
The internal UITextField that renders the text of this
TextArea."

in which the property could be found, but I can't seem to
access this property, I get the error: